1. Fractional division has the same meaning as integer division, that is, the operation of finding () by knowing the () of two factors and one of them.

2. Divider is a fractional division of integers. According to the division rule of (), the decimal point of quotient should be aligned with the decimal point of (). If there is a remainder at the end of the dividend, add () after the remainder to continue the division.

3. Divider and divisor are expanded at the same time 100 times, and the quotient is ().

4.7.986 accurate to the tenth place is (); Keep two decimal places is ().

5. Three decimal places are accurate to 1%, and the approximate value is 3.80. The smallest three-digit decimal may be () or ().

6. Fill in ">" or "in ()

3.45÷0.99 ( )3.45 1.88÷ 1.0 1( ) 1.88

Two. Calculation:

1. Numbers written directly:

6÷5= 0.2÷0.4= 1.6÷0.8= 4.2÷2. 1=

0.2×0.6= 4.6÷0.46= 0.52÷52= 7. 1÷0. 1=

2. Column vertical calculation:

18÷24= 43.68÷26= 25.3÷0.88=

Check calculation:

0. 1575÷3. 15= 0.6 12÷ 1.8= 16.787÷0.28

(Keep one decimal place)

3. Off-mold calculation:

2.6×(2. 139÷9.3×6.2) 16.75-(9. 1- 1.92)+ 1.62

2.6× 1.9÷2.6× 1.9 4.264÷(0. 16×20.5)

3. Application questions:

1. A road construction team can be built in 7.5 hours 136.5 meters. According to this calculation, how many meters can be built in 8 hours?

The length of the rectangle is 9.3 cm, which is equal to the width of 1.5 times. How many square centimeters is the area of this rectangle?

3. The construction team planned to repair the road in one day 1.65km, and it will be completed in 20 days. It actually took only 15 days. How many kilometers of roads are actually built every day?

The standard parts factory used 45,000 kWh of industrial electricity in June this year, and the electricity consumption in July was 2.6 times that in June. How many kilowatt hours have you used in two months?

5. Four mills grind 13 tons of flour within 5 hours. According to this calculation, how many tons of flour can four mills grind in 8.25 hours?

6. Oil can be squeezed from 240 kg rapeseed in Youfang 100.8 kg. According to this calculation, how many kilograms of rapeseed is needed to extract 2 10 kilograms of oil?